<template>
  <el-table ref="multipleTable" :data="formatData" :row-style="showRow" v-bind="$attrs">   <!--  @header-click="chooseall" -->
    <el-table-column :render-header="renderHeader" width="50" align="center">
      <template slot-scope="scope">
        <el-checkbox v-model="scope.row.checks" @change="toselect(scope.row)"></el-checkbox>
      </template>
    </el-table-column>
    <el-table-column v-if="columns.length===0" width="150">
      <template slot-scope="scope">
        <span v-for="space in scope.row._level" :key="space" class="ms-tree-space"/>
        <span v-if="iconShow(0,scope.row)" class="tree-ctrl" @click="toggleExpanded(scope.$index)">
          <i v-if="!scope.row._expanded" class="el-icon-plus"/>
          <i v-else class="el-icon-minus"/>
        </span>
        {{ scope.$index }}
      </template>
    </el-table-column>
    <el-table-column v-for="(column, index) in columns" v-else :key="column.value" :label="column.text" :width="column.width">
      <template slot-scope="scope">
        <!-- Todo -->
        <!-- eslint-disable-next-line vue/no-confusing-v-for-v-if -->
        <span v-for="space in scope.row._level" v-if="index === 0" :key="space" class="ms-tree-space"/>
        <span v-if="iconShow(index,scope.row)" class="tree-ctrl" @click="toggleExpanded(scope.$index)">
          <i v-if="!scope.row._expanded" class="el-icon-plus"/>
          <i v-else class="el-icon-minus"/>
        </span>
        {{ scope.row[column.value] }}
      </template>
    </el-table-column>
    <slot/>
  </el-table>
</template>

<script>
  /**
   Auth: Lei.j1ang
   Created: 2018/1/19-13:59
   */
  import treeToArray from "./eval";
  export default {
    name: "TreeTable",
    data() {
      return {
        chooseson: true, //全选
        key: true //单个点击直到全部选中
      };
    },
    props: {
      /* eslint-disable */
      data: {
        type: [Array, Object],
        required: true
      },
      columns: {
        type: Array,
        default: () => []
      },
      evalFunc: Function,
      evalArgs: Array,
      expandAll: {
        type: Boolean,
        default: false
      }
    },
    computed: {
      // 格式化数据源
      formatData: function() {
        let tmp;
        if (!Array.isArray(this.data)) {
          tmp = [this.data];
        } else {
          tmp = this.data;
        }
        const func = this.evalFunc || treeToArray;
        const args = this.evalArgs
          ? [tmp, this.expandAll].concat(this.evalArgs)
          : [tmp, this.expandAll];
        return func.apply(null, args);
      }
    },
    methods: {
      showRow: function(row) {
        const show = row.row.parent
          ? row.row.parent._expanded && row.row.parent._show
          : true;
        row.row._show = show;
        return show
          ? "animation:treeTableShow 1s;-webkit-animation:treeTableShow 1s;"
          : "display:none;";
      },
      // 切换下级是否展开
      toggleExpanded: function(trIndex) {
        const record = this.formatData[trIndex];
        record._expanded = !record._expanded;
      },
      // 图标显示
      iconShow(index, record) {
        return index === 0 && record.child && record.child.length > 0;
      },

      //设置表头全选
      renderHeader(h, data) {
        return h("span", [
          h("input", {
            attrs: {
              id: "chooseall",
              type: "checkbox",
              style:
                "border: 1px solid #dcdfe6;border-radius: 2px;box-sizing: border-box;width: 14px;height: 14px;background-color: #fff;"
            }
          })
        ]);
      },
      //功能函数:选中部分子集
      setchildtobeselect(arr, key) {
        arr.forEach((v, i) => {
          v.checks = key;
          // v._expanded = key;//选中后展开子项
          if (v.child) {
            this.setchildtobeselect(v.child, v.checks);
          }
        });
      },
      //是否所有的都被选中
      isallchecked(arr) {
        arr.forEach((v, i) => {
          if (!v.checks) {
            this.key = false;
          }
          if (v.child) {
            this.isallchecked(v.child);
          }
        });
      },
      //设置父级为 未选中状态（父级的父级没改变-有bug）
      setparentfalse(arr, id, level) {
        arr.forEach((v, i) => {
          if (v._level == level - 1 && v.child) {
            v.child.forEach((val, ind) => {
              if (val.id == id) {
                v.checks = false;
                return false; //终止此次循环，减少循环次数
              }
            });
          }
          if (v.child) {
            this.setparentfalse(v.child, id, level);
          }
        });
      },
      //设置父级为 选中状态
      setparenttrue(arr, id, level) {
        arr.forEach((v, i) => {
          if (v._level == level - 1 && v.child) {
            let key = true;
            let sameidkey = false;
            v.child.forEach((val, ind) => {
              if (val.id == id) {
                //确保当前点击的在该父级内
                sameidkey = true;
              }
              if (!val.checks) {
                key = false;
              }
            });
            if (key && sameidkey) {
              v.checks = true;
            }
          }
          if (v.child) {
            this.setparentfalse(v.child, id, level);
          }
        });
      },
      //某个复选框被点击时
      toselect(row) {
        console.log(row);
        // row._expanded = row.checks;//选中后是否展开
        //1、若有子集先让子选中
        if (row.child) {
          this.setchildtobeselect(row.child, row.checks);
        }
        //2、然后判断是否全选中
        this.key = true; //重置为true，防止上次已经是false的状态
        this.isallchecked(this.formatData);
        //3、设置多选框的状态
        if (!row.checks) {
          this.setparentfalse(this.formatData, row.id, row._level); //设置父级选中的状态为false
          document.getElementById("chooseall").checked = false; //设置全选框的状态
        } else {
          this.setparenttrue(this.formatData, row.id, row._level); //设置父级选中的状态为true
        }
        if (this.key) {
          document.getElementById("chooseall").checked = true; //设置全选框的状态
        }
      }
    },
    mounted() {
      this.$nextTick(() => {
        var that = this;
        const all = document.getElementById("chooseall");
        all.onchange = function(e) {
          console.log(all.checked);
          if (all.checked == true) {
            that.setchildtobeselect(that.formatData, true);
          } else {
            that.setchildtobeselect(that.formatData, false);
          }
        };
      });
    }
  };
</script>
<style rel="stylesheet/css">
  @keyframes treeTableShow {
    from {
      opacity: 0;
    }
    to {
      opacity: 1;
    }
  }
  @-webkit-keyframes treeTableShow {
    from {
      opacity: 0;
    }
    to {
      opacity: 1;
    }
  }
</style>

<style scoped>
  .ms-tree-space {
    position: relative;
    top: 1px;
    display: inline-block;
    font-style: normal;
    font-weight: 400;
    line-height: 1;
    width: 18px;
    height: 14px;
  }
  .ms-tree-space::before {
    content: "";
  }
  .processContainer {
    width: 100%;
    height: 100%;
  }
  table td {
    line-height: 26px;
  }
  .tree-ctrl {
    position: relative;
    cursor: pointer;
    color: #2196f3;
    margin-left: -18px;
  }
</style>
